When running `make kernel_menuconfig`, CPU_BIG_ENDIAN is selected by
default, resulting in a non-bootable image. Add CPU_LITTLE_ENDIAN to
avoid that.
Signed-off-by: Qingfang Deng <dqfext@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22282
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>